EFFECTS OF ELEMENT SULFUR ON CARBON ISOTOPIC FRACTIONATION OF METHANE
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摘要: 通过热模拟实验,系统研究了单质硫在有机质生成甲烷过程中对其碳同位素分馏的影响。结果表明,在低—中温条件下,对于产自假干酪根和全岩的甲烷来说,单质硫的存在,总体上使其碳同位素值变轻,但在不同温度段对不同母质的影响程度不同。单质硫的存在会导致普遍出现假干酪根甲烷碳同位素值轻于全岩甲烷碳同位素值;单质硫的存在可使全岩系列甲烷碳同位素值随有机质成熟度的增加反而变轻。研究还显示,单质硫主要是作为反应物参予反应从而影响甲烷碳同位素分馏。Abstract: The effects of element sulfur on carbon isotopic fractionation of methane have been systematically studied by the simulation experiments of thermal transformated methane from organic matter.The results show that during the low to middle temperature,the values of methane carbon isotope from similitude kerogen and total rock are lighter in the presence of element sulfur than in the absence of element sulfur.The changing extent of carbon isotope is different at different tempertures and the organic type by effects of element sulfur.Carbon isotopic value of methane from similitude kerogen is lighter than that from total rock in the presence of element sulfur.Carbon isotopic values of methane from total rock series are lightening with the increasing maturity of organic matter in the presence of element sulfur.Mechanics analysis revealed that element sulfur is mostly effect carbon isotopic values of methane as a reactant.
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Key words:
- sulfur /
- carbon isotopic fractionation /
- methane /
- thermal simulation experiment
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[1] Schoell M.The hydrogen carbon isotopic composition of methane from natural gases of various origin[J].Geochimica et Cosmochimica Acta,1980,44:649 ~ 662 [2] 徐永昌.天然气成因理论与应用[M].北京:科学出版社,1994.24~25 [3] 刘光祥,陶静源,潘文蕾等.川东北及川东区天然气成因类型探讨[J].石油实验地质,2002,24(6):512~516 [4] 戴金星.威远气田成藏期及气源[J].石油实验地质,2003,25(5):473~480 [5] 孟卫工.碳同位素组成异常的天然气成因探讨——以辽河坳陷东部凹陷为例[J].石油实验地质,2004,26(6):583~589 [6] Bradley J Huizinga,Tannenbaum Eli,Kaplan I R.The role of minerals in the thermal alteration of organic matter-Ⅲ.Genera tion of bitumen in laboratory experiments[J].Organic Geochemistry,1987,11:591~604 [7] Li Shuyuan,Guo Shaohui,Tan Xuefei.Characteristics and kinetics of catalytic degeradation of immature kerogen in the pre-sence of mineral and salt[J].Organic Geochemistry,1998,29:1 431~1 439 [8] Espitale J,Madec M,Tissot B.Role of mineral matrix in kerogen pyrolysis:influnce on petroleum generation and migration[J].AAPG,1980,64:59~66 [9] Mango Frank D.Transition metal catalysis in the generation of petroleum and natural gas[J].Geochimica et Cosmochimica Acta,1992,56:553~555 [10] 张晓宝,马立元,孟自芳等.柴达木盆地西部第三系盐湖相天然气碳同位素特征、成因与分布[J].中国科学D辑,2002,32(7):598~608 [11] Sassen Roger,Chinn E W.Effects of elemental sulfur during programmed pyrolysis of kerogen[J].Organic Geochemistry,1989,14:475~477 [12] 彭平安,傅家谟,盛国英.膏盐沉积环境浅成烃类的有机地球化学特征[J].中国科学B辑,1989,(1):83~93 [13] 张更新.单质硫对有机质演化成烃的影响:[学位论文].兰州:中国科学院兰州地质研究所,2001 [14] 秦匡宗,郭绍辉,李术元.有机地质大分子结构与未熟油生成[J].石油勘探与开发,1997,24(5):1~6 [15] 王培荣,陈奇,何文祥等.未熟-低熟阶段有机质的"两极分化"作用——低熟低压加水热模拟实验[J].科学通报,1999,44(2):208~211 [16] 夏燕青,王春江,孟仟祥等.硫芴和氧芴成因模拟[J].科学通报,1998,43(15):1 661~1 663 [17] 夏燕青,王春江,孟仟祥等.联苯系列化合物与苯并萘噻吩系列化合物的形成机制[J].中国科学D辑,1999,29(3):257~262 [18] 倪沛洲.有机化学[M].北京:人民出版社,2003.167~168
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